Biodiversity: The Known, Unknown, and Rates of Extinction Mark J. Costello  Current Biology  Volume 25, Issue 9, Pages R368-R371 (May 2015) DOI: 10.1016/j.cub.2015.03.051 Copyright © 2015 Elsevier Ltd Terms and Conditions

Figure 1 Marine biodiversity. Examples of marine species discoveries and habitat diversity: marine snails (top left), deep-sea crustaceans (hydro-thermal vent copepod; shrimps and lobster) (centre), cave dwelling coral (top right), the disc antenna bryozoan (below coral) and a sea spider (bottom right) discovered recently (images with permission from E. Rolán and S. Gori; M. Caballer; V.N. Ivanenko and P.H.C. Corgosinho; T.-Y. Chan; M. Türkay; B.W. Hoeksema; D. Gordon, C. Taylor and C. Arango). The main image is a deep-sea coral skeleton with species from at least eight phyla: anemones, starfish, basketstars, brittlestars, squat lobster, barnacles, hydroids, eel, worm tubes, sponge and other corals (image by S. Johnsen et al.). Current Biology 2015 25, R368-R371DOI: (10.1016/j.cub.2015.03.051) Copyright © 2015 Elsevier Ltd Terms and Conditions

Figure 2 Extinctions. (A) The number of extinct species amongst the 226,000 marine, 126,000 freshwater and 1,150,000 terrestrial named species. (B) The percentage of species in these environments that are extinct (black bars) and threatened (hollow bars). Data from IUCN Red List of Threatened Species (version 2014.2 accessed www.iucnredlist.org, 17 December 2014). Current Biology 2015 25, R368-R371DOI: (10.1016/j.cub.2015.03.051) Copyright © 2015 Elsevier Ltd Terms and Conditions